Electroprotective system for locks



(No Model.) 7 2 Sheets-Sheet 1.

M. MARTIN.

BLEGTROPROTBGTIVE SYSTEM FOR LOOKS.

Patented June 5. 1894.

Irpfe 11 a Br.

E E E E E- wil 9 t e e h S S t e e Patented June 5, 1894,

Ns =i wmm m. I TH MQ win Egg UNITED STATES PATENT" OFFICE.

MORRIS MARTIN, OF ,MALDEN, ASSIGNOR OF ONE-HALF TO BENJAMIN V. \VELLS,OF BOSTON, MASSACHUSETTS.

ELECTROPROTECTIVE SYSTEM FOR LOCKS.

SPECIFICATION forming part of Letters Patent NO. 520,795, dated June 5,1894.

Application filed November 23,1893. 'Serial No. 491,720. (No model.) I

To all whom it may concern:

Be it known that I, MORRIS MARTIN, residing in Maiden, in the county ofMiddlesex and State of Massachusetts, have invented an Improvement inElectroprotective Systems for Locks, ofwhich the following description,in connection with the accompanying drawings, is a specification, likeletters and figures on the drawings representing like parts.

This invention relates to an electro-protective system for the locks ofdoors, and is more especially designed and adapted for stores and likeplaces. The doors of stores andlike places are nowcommonly provided witha lock, which is operated by a key usually intrusted to the clerk, whoseduty it is to open the store in the morning, the store-door being closedand locked by the same person or by the employeror another employprovided with a duplicatekey. The lock of the storedoor from the time ofclosing inthe evening to the time of opening in the morning, may beoperated to unlock the door by either of these duplicate keys.

This invention has forits object-to provide an electro-protective systemfor stores and like places, including a novel lock for the doorcomprising a bolt mechanism, constructed to be operated by two keys ofdifferent make or design, one of which may be designated the employskey, and the other the master-key, which in practice, will usually be inthe possession of the proprietor of the store. The lock in onecondition, to be hereinafter described, is preferably electricallycontrolled, so that during the time the lock is so controlled, theemploys key is rendered inoperative for the purpose of unlocking thebolt mechanism. The system also preferably includes a registering orrecording mechanism, operatively connected to the lock and preferablylocated in the office of the store or like place and accessible only tothe proprietor or other duly authorized person, the said re isteringmechanism, for purpose of this invention, being designated as thecentral office message receiving instrument.

The system may and. preferably will further include, an indicatingdevice or mechanism at the lock, operatively connected to the said lockto indicate the nu mberof times the bolt mechanism has been operated,the said lock indicating mechanism preferably being constructed, so thatwhen the lock is lawfully operated, it will agree with the register orrecording mechanism of the system, and also so constructed toindicatethe operation of the lock independent of the register or recordingmechanism. The lock indicator is also preferably constructed to beresponsive for a predetermined number of operations of the look, butwhich becomes inoperative when the highest indication is reached, andremains inoperative at the highest indication until reset or brought tostarting position by the employer or his duly authorized agent, as willbe described. These and other features of this invention will be pointedout in the claims at the end of this specification.

Figure l is a perspective view partially broken out of a central officereceiving instrument or registering mechanism employed in a systemembodying this invention; Fig. 2, a front elevation of a lock embodyingthis in vention, the face plate of the lock being removed to moreclearly show the interior con strnction, the door being represented bydotted lines; Fig. 3, a rear elevation of the lock shown in Fig. 2;Figs. 4 and 5, details to be referred to; Fig. 6, a diagram of circuitsto enable the operation of the system to be more clearly understood.

The lock for the door may and preferably will be made substantially asshown in Fig.

2, wherein A represents a frame or casing of metal or other suitablematerial, containing within it a lock mechanism, consisting, as hereinshown, of a bolt a adapted to be moved through a suitable slot oropening in the side a of the casing and into a suitable socket afastened to the jamb a of the door, represented by dotted lines.

The bolt a may be guided in its movements in any suitable manner, and isherein shown as supported by means of a stud or projection a secured toor forming part of the rear plate a of the casing A, the said studextending into a substantially long slot a in the bolt a. The bolt a, inthe present instance, is provided on its lower portion or edge with twonotches or recesses a a, the notch a, be-

ing made much longer than the notch M, for a purpose as will bedescribed.

The belt a in accordance with this invention is designed to be operatedfrom the outside of the door by two keys, not herein shown, but whichmay be of the well known Yale type of key, one of the said keys in thepresent construction of the lock, actuating a supplemental key a and theother key actuating a supplemental key a, the keys a a being pivotallyfastened to the back plate a of the casing A. The supplemental keys a a,are provided, as herein shown, with bits a a respectively, the bit abeing adapted to enter the notch a in the bolt a,'and the bit at toenter the notch a The outside key, which operates the supplemental key aI prefer to designate as the employs key, and that which operates thesupplemental key a as the master key. The master key is designed tooperate the bolt a at any time and under all conditions, while theemploys key is designed to be rendered non-operative on the belt a undercertain conditions as will be hereinafter explained. To effect thisresult in the present construction of the lock, the notch a in the bolta is made of such length, that the key a might be turned either to theright or left without engaging the sides of the said notch, if provisionwere not made to practically divide or shorten the length of the notch.a, so as to enable the bit a of the key a to move the bolt. This may beaccomplished, as herein shown, by means of a movable device or tumbler,shown as an elbow lever a pivoted as at b to the bolt a, and having onearm b provided with a finger I), normally projecting by the notch a, asshown in Fig. 2, in which position, the said finger forms with one side2 of the notch, a smaller notch or receptacle 5 into which the bit a isadapted to enter, when the key (t is turned to operate the bolt, thesaid bit engaging the side 2 of the notch to move the bolt into itssocket a to lock the door, and engaging the finger b to move the boltbackward to unlock the door. The fingerb' is adapted to be moved fromits normal or operative position shown by full lines, Fig. 2, out of thepath of movement of the bit a of the key a and into its dotted lineposition, by a suitable device, shown in the presentinstance as thearmature b of an electro-magnet b suitably supported within the case A,the said armature being pivoted as'at b and normally lying beyond thefield of its magnet and. in the path of movement of the arm b of theelbow lever a. The arm 11 is shown as provided at its end with ashoulder or projection b adapted to engage the end of the armature Z).In the normal or full line position of the tumbler a, the bolt may bemoved into its socket a by the employs key, the bit a engaging the side2 of the notch forming one wall of the chamber 11 and on the forwardmovement of the bolt a, the shoulder b strikes the armature b, whichbeing fixed by its pivot Z), causes the elbow leverd to turn on itspivotb on the continued forward movement of the bolt 01, so that by thetime the bolt has entered its socket, the elbow lever will be turnedinto its dotted line position Fig. 2, and the fingerb will be withdrawnfrom the path of movement of the employs key, or in the presentinstance, from the path of movement of the bit a of the supplemental keya lVhen the finger b is raised as described, the employs key is rendereduseless or inoperative until the finger b is released from its abnormalor dotted line position, which is accomplished in the present instance,by energizing the electroanaguet if, as will be described.

The lock mechanism shown in Fig. 2 may and preferably will form part ofan electrical system, including a main or central station apparatus,preferably of the construction shown in Fig. 1, wherein A represents theinclosing case of a clock mechanism A of any usual or suitableconstruction, the casing A being made of wood or other insulatingmaterial and having as represented, a face plate 0 and top plate 0' ofmetal or other conducting matcrial, the face plate 0 being thuselectrically separated from the clock movement A The face plate 0 isprovided, as shown, with the usual graduations or numbers indicative ofhours and minutes, and is provided at its center with an opening throughwhich the hour and minute arbors of the clock are extended, and areprovided outside the face plate with the usual hour hand 0 and minutehand 0 The face plate 0 has movably attached to it in any suitablemanner, a ring 0 provided with graduations or numbers corresponding tothe numbers or graduations on the face plate, the said ring havingsecured to it one member of a circuit controller, which member is shownin the present instance as a fiat spring or pen a", secured to the innercircumference of the ring 0 and co-operating with a second member of thesaid circuit controller, shown as an arm or projection c movable withthe hour hand 0 The arm 0 may be secured to the arbor of the hour handor to the hour hand itself. The casing A also contains within it asecond circuit controller, one member of which may be made as hereinshown, it consisting of a metal disk or wheel 0 provided with teeth orperipheral projections o and mounted upon a shaft or arbor c supportedby the framework of the clock A the said arbor also having mounted on ita second disk or wheel 0 of insulating material and provided with teethor projections 0 corresponding to the teeth c the alternate metal teeth0* being made shorter than the alternate teeth a for a purpose as willbe described. The toothed disks or wheels 0 0 are rotated, as hereinshown, by means of a stud or projection 0 011 the face of a disk orwheel 0 fast on the hour shaft or arbor of the clock mechanism A Theteeth of the wheels or disks c 0 are preferably made concaved on theirouter surface ITO and have co-operating with them a terminal pen orbrush (see Fig. secured to an insulating support 0 within the casing A,and forming the other member of the said circuit controller, for apurpose as will be described. The casing A, as represented in Fig. 1,also contains within it an electro-magnet d having its pole pieces d, asherein represented, extended through the top plate 0 of the casing andco-operating with an armature (Z shown as pivoted as at (Z to lugsorbrackets d erected upon the top plate 0. The armature (Z 'asrepresented in Fig. 1 has secured to it an arm d, provided at its frontend with a prick point or stylus d adapted to be brought in contact withand puncture a re cording surface shown as a strip or tape 61 providedwith suitable graduations to indicate different intervals of time, thegraduations as herein represented indicating hours. The recording tape din the present instance is shown as mounted on a drum or reel d havinghearings in uprights d erected from the top plate 0', and as shown, thesaid recording strip is passed beneath a guide bar (Z fastened to thetop plate, and the said strip is also passed through holding jaws orarms (Z The recording strip (1 is adapted to be fed forward under themarking pen or stylus d by means of a feed mechanism, which may be ofany usual-or suitable construction, and which is represented in Fig. 1as a toothed feed wheel d mounted upon a shaft (Z of the clockmechanism, the said shaft being geared to the clock mechanism so as tofeed the recording strip (Z in unison with the hour hand of the clock.The recording strip 61 in the present instance is shown as held inengagement with the feed roll or wheel at by means of a presser roll dmounted on a lever (1 pivoted as at (Z to an upright or bracket (Zerected from the top plate 0, the said lever having its rear armprovided, as represented in Fig. 1, with a spring arm (1 engaged by anadjusting screw (Z by means of which the pressure of the roll (7, uponthe paper may be regulated. As represented in Fig. 1, the top plate a isprovided with two binding posts (Z (Z both of which are insulated fromthe said top plate. The electro-magnet d, which may be .hereinaftertermed the register or recording magnet, has one end of its coilconnected by wire (Z to the binding post (Z and the other end of itscoil connected by wires (K d to the binding post (Z The binding post (Zis also electrically connected with the face plate 0, which may beaccomplished as representedin Fig. 1, by connecting the said bindingpost by the wire (Z to a contact pen or spring (Z secured to aninsulating support (1 located within the casing, the spring (Z beingadapted to bear against the face plate 0.

The circuit of the lock magnet Z1 as above described, is governed inpart by two circuit controllers operated from the hour arbor or shaft ofthe clock movement or mechanism A and preferably the said circuit isalso governed by a third circuit controller located at the lockmechanism and comprising two memhere, one member of which is shown inFig. 2 as a contact spring or brush (Z secured to an insulating block @1and adapted to be engaged by the arm b of the elbow lever or tumbler,which constitutes the other member of the circuit controller located inthe look. It will thus be seen that to complete the circuit of the lockmagnet b three circuit controllers are required to be closed in thepresent arrangement, namely, the circuit controller located in the lockand the two circuit controllers operated by the clock mechanism of thecentral office apparatus, as will be hereinafter more fully explained.

The register magnet cl is included in circuit with a circuit controllerat the lock, which may be directly or indirectly governed by themovement of the lock mechanism, and which in the present instance isshown as composed of two members, one memberbeing represented as a stude on the bolt a, and the other member as a contact pen e secured'to theinsulating support 02 the said contact pen being extended into the pathof movement of the stud c, so that when the bolt a is moved forward orin the direction indicated by arrow 20, Fig. 2, to lock the door, thesaid stud will be'momentarily brought in contact with the pen 6, andwillthereby momentarily close the circuit of the register magnet d, aswill bemorefullydescribed, and on the further movement of the bolt inthe direction indicated by arrow20, the stud e will pass by and out ofcontact with the pen 6' and substantially into the position indicated bydotted lines Fig. 2, so that, when the bolt a is moved backward or inthe direction opposite to that indicated by arrow 20, the stud 6 will beagain brought in contact with its co-operating pen 6', to again closethe circuit of the register magnet cl. In this manner, it will be seenthat the register magnet cl is energized on each movement of the bolt a,that is, when it is moved in one direction to lock the door and when itis moved in an opposite direction to unlock the door, the purpose ofwhich will be hereinafter more fully set forth.

Referring to Fig. 2, the casing A is represented as having mounted uponit three binding posts e e 6 the binding posts c e be ing electricallyseparated from the casing A as by insulating washers c and the bindingpost 6 being represented as electrically connected with the casing A.The binding post e is connected by wire a to the contact member orterminal 6', while the binding post c has connected to it one end (2 ofthe coil of the electro-magnetb the other end a of the said coil beingelectrically connected to the contact pen or terminal d The operation ofthe electrical circuits, as thus far described, may be more clearlycomprehended by referring to the diagram, Fig. 6, wherein theregistering apparatus is rep- IIO resented as located within a case B,which in practice will preferably be provided with a door having a lock,the key of which is designed to be retained in the possession of theproprietor or his duly authorized agent, so that only the proper partiesmay have access to the registering apparatus.

The caseB is represented as provided with three binding posts orterminals e e 8 the binding post 6 being connected by wire 6 to thebinding post (1 and the binding post 6 being connected by wire 6 to thebinding post (1 while the binding post 6 is connected by wire 6 to thecontact pen or member 0 of one of the circuit controllers in the clockmechanism above referred to. The binding post 6 is shown as connected bywire e" to one pole of a battery B, herein shown as the negative pole,the positive pole of which is connected by wire a to the binding post 6of the lock mechanism. The binding post e is connected by wire a to thebinding post 6 of the lock, and the binding post 6 is connected by wire6 to the binding post 6 of the lock.

In order that the invention may be more clearly comprehended, I willdescribe the circuits including the magnets 19 and d with the circuitcontrollers governing them in their closed position, and willhereinafter more specifically describe the manner of bringing thecircuit controllers into their operative position. As above described,the register magnet d is governed by the circuit controller comprisingthe members 6 c, and for purpose of illustration, let it be supposedthat the member 6 has been brought into contact with the member 0, andwhen in this condition, the circuit of the register magnet d iscomplete, which circuit may be traced in the diagram, Fig. 6 asfollows:- from the positive pole of the battery B by wire 6 to thebinding post a thence through the metallic framework of the lock to thestud e, thence by the contact spring e, wire a to the binding post 6which, as above described, is insulated from the casing A of the lock.From the binding post 6 the circuit continues by the wire e to thebinding post 6 of the casing B containing the registering mechanism, andfrom the binding post e the circuit is continued by the wire a, bind ingposts (Z Wire (1 through the register magnet d and wires (1,(1 to thebinding post (Z thence by wire e binding post 6 and wire 6" to thenegative pole of the battery B. As soon as the circuit of the magnet (1is completed as above described, the said magnet attracts its armature dand effects a marking on the recording surface (i The circuit of thelock magnet 11 as above described, is dependent in the presentarrangement upon the closure of three circuit controllers, namely, onein the lock and two in the recording apparatus.

I have represented in the diagram, Fig. 6, the circuit as closed at thevarious circuit controllers, the arm b of the elbow lever or tumblerbeing in contact with the spring (1 the pen 0 being in engagement with ametallic tooth on the wheel a and the arm 0 being in engagement with theterminal spring a. In this case, the circuit may be traced asfollows:from the positive pole of the battery B by wire 6 to bindingpost e thence by the metallic portion of the lock mechanism to thetumbler arm b thence by the contact spring (Z wire 6 through the magnetb wire 6 to the binding post a thence by wire 6 to the binding post e ofthe case B, thence by wire 6 to the contact pen c, the wheel or disk cthence to the clock movement and arm 0 to the terminal spring 0, thenceby wire (1 to the binding post (Z thence by wire a, binding post 6 andwire 6 to the negative pole of the battery.

The lock is provided with a mechanism to indicate the operation ofthebolt mechanism and this indicating mechanism may and preferably willbe made as herein shown, it consisting of a dialf mounted on the back ofthe lock and provided with graduations or numbers preferably indicatingtwo or multiples of two, the highest number in the present instancebeing eighteen. The dialf has co-opcrating with it an index or pointerfmounted on a shaft f extended into the case A and having bearings, asherein shown, in the said case and in a bracket f fastened to the backplate of the said case. The shaft f has fast on it a ratchet wheel f,with which co-operates a push pawlf and a holding pawl f the push pawlfbeing shown as secured to the bolt a and operating on the backwardmovement of the bolt to rotate the ratchet wheel the distance of twoteeth, to thereby move the index or pointer f the distance of twograduations, the holding pawl f acting to keep the ratchet wheel fromrotating when the bolt a is moved forward. The holding pawl f may bekept in engagement with the ratchet wheel, as represented, by a springf. To permit the belt a to be operated at will from inside of the storeor other place, the bolt 66 may be provided with a tumbler g pivoted asat g and provided with a fork at its lower end, which is engaged by adog 9 on a shaft 7 extended through the back plate of the lock andprovided, as herein shown, with a head or thumb piece g (see Fig. 3) byturning which the dog g may be oscillated to operate the bolt in eitherdirection. The back plate a of the lock is preferably hinged to itscasing, and in order to prevent the said plate being opened byunauthorized persons, a locking device is provided which is undercontrol of the master key of the lock. The locking device referred to,is shown in Fig. 2 as a bar 9 vertically movable in guides g attached tothe side of the case A, the said bar being provided with lugs Q13, g toengage fingers or lugs g 9 on the back plate a the said bar beingprovided at its lower end with a substantially long arm g", adapted toengage the bit a of the supplemental key operated by the master key, sothat the looking bar g cannot be moved upward to disengage its lockingprojections or lugs g, g from the fingers g, 9 until the bit a is turnedby the master key out of engagement with the arm g", and when so turned,the bar g may be moved upward or in the direction indicated by arrow 30,Fig. 2, by the thumb piece g on the outside of the lock, the said thumbpiece having a stem or shank g extended through a slot g in the case Aand fastened to the bar The system as abovedescribed is designed for theprotection of stores and like places from being entered betweenpredetermined intervals of time, except by the person holding the masterkey of the lock. After a given hour, which may be supposed to be thehour of closing, say for instance, six oclock p. m., the employs key isrendered inoperative, and the bolt mechanism cannot be operated by theemploys key from this time until the time of opening in the morning,which may be supposed to be seven oclock. When the person, who closesthe store and locks the door, operates the bolt mechanism, which may beeffected with either the master key or the employs key, the tumbler a onthe forward movement of the bolt is removed out of the path of movementof the employs key as above described, it being moved into the dottedline position shown in Fig. 2. If now an attempt should be made by aperson having an employs key to unlock the door after it has beenlocked, the key would turn in the substantially long notch a of the boltand would not operate the bolt. When the door is locked, the circuitcontroller or stud e is brought into engagement with the contact pen 6'and closes the circuit of the magnet d as above described, therebyeffecting upon the recording strip or surface (1 a record of the lockingof the door and the time at which the same was locked. WVhile thetumbler 0, is in its elevated position, the bolt still remains under thecontrol of the master key and, if after the hour of closing, the masterkey should be used to unlock the door, a record of this fact would bemade upon the recording surface, for the stud e on its movement backwardfrom its dotted line position Fig. 2 into its full line position, wouldagain close the circuit of the register magnet d. The locking mechanismis designed to be again placed in condition to be operated by theemploys key after the lapse of a predetermined interval of time, whichmay be from six oclock at night, the hour of closing, until seven oclockthe following day, the hour of opening. The hour at which it is desiredto again place the lock in condition to be operated by the employs key,may be selected by turning the graduated ring 0 so as to have, forinstance, the hour seven register with the arrow 50 on the face plateshown in Fig, 1, when it is desired to open the store or like place atseven oclock a. 111. When the graduated ring a is placed so that itsgraduation 7 is in line with the arrow 50, the member 0 of the circuitcloser will be brought into proper position to have the arm or member 0which co-operates with it, make contact with the terminal pen 0 at sevenoclock a. m. and at the same time, the stud c on the disk or wheel 0will have moved the disks 0 0 so as to bring a raised or circuit closingtooth of the same into engagement with the terminal pen 0 and when thecircuit closers of the registering mechanism are in this condition, themagnet b is automatically energized, wh ch attracts its armature b fromits dotted line position shown in Fig. 2 toward its pole pieces, therebyremoving the said armature from en gagement with the arm I) of thetumbler a and permitting the said tumbler to fa ll by gravity into itsfull line or operative position, thereby placing the bolt mechanism incondition to be operated by the employs key. The alternate teeth on theinsulating disk 0 which project beyond the corresponding teeth of thedisk a are designed to break or open the circuit of the magnet Z1 once1n twelve hours, so that the circuit of the magnet I) is closed or putin operative condition only once in twenty-four hours, that is, when thearm 0 is in contact with the pen a, and a the pen 0 is in contact with aconducting tooth on the disk 0 which prevents the magnet b releasing thetumbler at seven oclock in the evening. For instance, the proprietor maywant the store to be opened at seven oclock a. m., and during the day,for instance at noon-time, he may set the graduated ring 0 so that thenumber 7 on the ringregisters with the arrow 50. It will be seen thatthe circuit controlling member 0 at seven oclock in the evening wouldmake contact with the terminal spring 0 and would energize the magnet bif the circuit was not broken at some other point. In the presentarrangement, the circuit is broken by having the pen 0 engage aninsulated tooth o at seven oclock in the evening,and when seven oclockin the morning is reached, the arm 0' will make contact with the spring0 and the pin 0 will at such time be in contact with a conducting toothof the wheel 0 In order to prevent the battery running down while thearm 0 is in engagement with the pen 0 and while the pen 0 is inengagement with a conducting tooth on the disk 0 I prefer to employ thetumbler arm b as one member of a circuit controller, the other member ofwhich is the spring al so that as soon as the tumbler is released by theenergizing of the lock magnet b the circuit of said magnet will beopened substantially in an instant after the said circuit has beencompleted as above described.

When the bolt is moved backward to unlock the door, the ratchet wheel fis moved the distance of two teeth so as to turn the index or pointer fthe distance of two graduaable member m, shown as a pivoted lever,

tions on the lock indicator or dialf, whereby the employer may have arecord or indication at the lock that the said lock has been operatedafter the hour for closing.

Thelock indicator is especially advantageous 1n that it prevents shortcircuiting or cutting the circuit wires, &c., for the lock cannot beopened without showing it on the dial, even though no record is made atthe central station, and if the door is opened while the electriccircuits remain intact, the lock ind cator will agree with the number ofindications or marks on the recording surface (1 In order to prevent anemploy from short clrcu ting the registerand then operating the locklndicator a sufficient number of times to cause it to agree with theregistration on the recording surface (1 at the central office, theratchet wheel f is rendered inoperative after the lock has been openedand closed a sufficient number of times, to bring the pointer or indexfin register with a predetermined indication on the dial, herein shown as18. 'lhe ratchet wheelf may be rendered inoperative as represented inFig. 2 by securing to it a blank or guard h, which prevents the pushpawl f from engaging the teeth of the ratchet after the ratchet wheelhas been turned to bring the index to the predetermined indication onthe dial, and as a result, a further movement of the bolt mechanism willcause the push pawl f to push back and forth on the blank or guard h,thus preventing the lock indicator from being turned beyond the highestregistration by movement of the bolt and requiring the said indicator tobe reset to zero by the employer.

At certain times, say for instance when taking account of stock in thestore, it may be desired to render the employs key operative at any timeduring specified hours, and to effect this result, a circuit controllerincluded in a shunt around the central office apparatus is arranged soas to render the employs key operative for any desired time. This may beeffected as shown in Fig. 6, by means of a circuit controller having itsmovjoined by wire on to the binding post 6 and its co-operating member,shown as a stud m joined by wire m to the binding post 0 so that whenthe member on is moved into engagement with the member m the shuntcircuit around the receiving apparatus is closed, the bolt a, at suchtime, being supposed to be in its socket. By an inspection of Fig. 6, itwill be seen that as soon as the tumbler arm b is brought intoengagement with the contact pen d, on the forward movement of the bolt ato lock the door, the shunt circuit will be closed in the lock and themagnet b energized to release the said tumbler and permit it to drop inposition to be operated by the employs key from outside the door. Thisshunt circuit may be traced as follows: viz:from the positive pole ofthe batteryB by wire e binding post 6 lock mechanism and tumbler arm bto contact pen (Z thence by wire a magnet 1), wire chbinding post a,wire 6 to binding post 6 thence by wire n contact stud m lever m, Wire mto binding post 0 thence by wire e to the negative pole of the batteryB.

At the expiration of the predetermined time, the switch or circuitcontroller m may be moved to open the shunt circuit andthereby renderthe employs key inoperative on the locking of the door until the regularopening hour. This circuit controller ust referred to, may be in itselfa time movement operated by a clock, but is herein shown as a manuallyoperated switch.

I may prefer to use the construction of lock indicator herein shown anddescribed, but I do not desire to limit my invention in this respect, asit is evident I may employ instead thereof, a continuous counter afterthe manner of the ordinary gas meter indicator or such as commonlyemployed for recording the revolutions of shafting.

For convenience in construction, I prefer to make the toothed disks orwheels 0 0 as herein shown, but it is evident that the same may be madein other ways, for instance, a single metal disk may be used having itsalternate teeth made of insulating material.

I claim-- 1. In an electro-protective system, the combination of thefollowing instrumentalities, viz:a lock provided with a circuitcontroller, and a registering apparatus provided with an electro-magnetin circuit with said circuit controller and energized by the operationof the said lock, substantially as described.

2. In an electro-protective system, the combination of the followinginstrumentalities, viz:a lock constructed to be operated by either oftwo keys in one condition and to be operated by only one of said keys inanother condition,an armature in said lock to hold it in its secondcondition, an electro-magnet to operate said armature to restore thelock into its first condition, and a circuit controller to govern theoperation of said electro-magnet, substantially as described.

3. In an electro-protective system, the combination of the followinginstrumentalities, vizz-a lock constructed to be operated by either oftwo keys in one condition and to be operated by only one of said keys inanother condition, an armature in said lock to hold it in its secondcondition, an electro-magnet to operate said armature to restore thelock into its first condition, a clock mechanism, a circuit controllerfor said electro-magnet operated by said clock mechanism to close thecircuit at a predetermined interval of time, and a second circuitcontroller operated by the clock mechanism to close the circuitincluding the electro-magnet ata predetermined interval of time lessthan the first interval of time, substantially as described.

4. In an electro-protective system, the combination of the followinginstrumentalities,

IIO

viz:-a lock provided with a circuit controller, and'a registeringapparatus provided with a recording surface, a marking device to operatethereon, and an electro-magnet in circuit with said circuit controllerand energized by the operation of said lock, substantially as described.

5. In an electro-protective system, the combination of the followinginstrumentalities, vizz-a lock constructed to be operated by either oftwo keys in one condition and to be operated by only one of said keys inanother condition, an armature in said lock to hold it in the secondcondition, an electro-magnet to operate said armature to restore thelock into its first condition, a registering apparatus provided with anelectro-magnet, a circuit controller in the said lock actuated by theoperation of the lock to energize the register electro-magnet, and acircuit controller at the registering apparatus to energize the lockmagnet, substantially as described.

6. In an electro-protective system, the combination of the following,instrumentalities, viz:a lock constructed to be operated by eitherof twokeysin one condition and to be operated by only one of said keys inanother condition, a device in said lock to hold it in its secondcondition, an electro-magnet to operate said device to restore the lookinto its first condition, a registering apparatus provided with anelectro-inagnet, a circuit controller in the said lock actuated by theopera tion of the lock to energize the register electro-magnet, acircuit controller at the registerin g apparatus to energize the lockmagnet, and an indicator at the lock actuated by the operation of thelock, substantially as described.

7. A look provided with a bolt mechanism and with a movable tumblerco-operating with the said bolt mechanism to permit the said bolt to beoperated by either of two keys of diiferent design or make, meansrendered effective by the movement of the bolt to move said tumbler outof the path of movement of one of said keys to render said keyinoperative, and means to restore the said tumbler to its normalposition in the path of movement of its co-operating key to render thelatter key again operative, substantially as described.

8. In an eleotro-protective system, the combination of the followinginstrumentalities, viz2-a lock constructed to be operated by either oftwo keys in one condition and to be operated by only one of said keys inanother condition, a device in said lock to hold it in its secondcondition, an electro-magnet to operate said device to restore the lookinto its first condition, a registering apparatus provided with anelectro-magnet, a circuit controller in the said lock actuated by theoperation of the lock to energize the register electro-magnet, and acircuit controller to energize the lock magnet, substantially asdescribed.

9. In an electro-proteotive system, the combination of the followinginstrumentalities, viz:a lock constructed to be operated by either oftwo keys in one condition and to be operated by only one of said keys inanother condition, a device in said lock rendered effective by themovement of the bolt to hold it in its second condition, and means tooperate said device to restore the lock nto its first condition,substantially as described.

10. Alock provided with abolt mechanism, and with a device to permit thesaid bolt mechanism to be operated by either of two keys of differentmake or design, means rendered effective by the movement of the bolt tooperate said device to render one of said keys noperative, and means tooperate said device to render the said key again operative, substantially as described.

11. A look provided with abolt mechanism, and with a device to permitthe said bolt mechanism to be operated by either of two keys ofdifferent make or design, means rendered effective by the movement ofthe bolt to operate said device to render one of sa d keys inoperative,and means to operate said device to render the said key again operative,and an indicating device to denote the number of operations of the lookto a predetermined number, substantially as described.

12. In an electro-protective system, the combination of the followinginstrumentalities, viz :-a lockprovided with a circuit controller, aregistering apparatus provided w th an electro-magnet in circuit withsaid c rcuit controller and energized by the operation of said look, ashunt circuit for said register magnet and a circuit controller for saidshunt circuit, substantially as described.

13. The combination with a lock of an indicator responsive to theoperation of the lock for a predetermined number, and means to renderthe said indicator non-responsive to the operation of the look and yetpermit the said lock to be operated after the saidpredetermined numberof operations at which the indicator is rendered non-responsive,substantially as described.

l t. The combination with a lock provided with a removable cover orplate, of a locking device for said cover or plate under the control ofthe key for the lock, substantially as described.

15. In an electro-protective system, the combination of the followinginstrumental ties, vizz-a lock constructed to be operated. by either oftwo keys in one condition and to be operated by only one of said keys inanother condition, an armature in said lock to hold it in one of saidconditions, an electro-mag iet to operate said armature to place thelock in the other of said conditions and a circuit controller to governthe operation of the said electromagnet, substantially as described.

16. In an electro-protective system, the combination of the followinginstrumentalities, viz:-a lock provided with a circuit controller,

ICC

FIG

[0 to restore the lock to an operative condition to enable theinoperative key to again become operative, substantially as described.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

MORRIS MARTIN.

Witnesses:

J AS. H. CHURCHILL, l J. MURPHY.

